What does Catalina mean?
The Spanish form of Katherine, from the Greek Aikaterine, whose original meaning is unknown. Early Christians associated it with the Greek katharos 'pure', which reshaped the spelling (with -th-), but that 'pure' sense is a later folk association rather than the true root.
What does Mariana mean?
The Spanish form of the Latin Mariana, feminine of Marianus, a name derived from the Roman family name Marius (itself of uncertain meaning). From early times it was reinterpreted as a derivative of María, blending the two associations.